function Bomb() {
    this.start = function () {
        id = setTimeout(function () {
            console.log('爆炸');
        }, 3000)
    }
    this.clear = function () {
        clearTimeout(id);
    }
}
var b1 = new Bomb();
var b2 = new Bomb();
b1.start();
b2.start()
setTimeout(() => {
    b2.clear();
}, 1000);